Cryptograms are great for increasing focus and memory. These expertly made cryptogram puzzles are based on letter replacement encrypted puzzles. Activity puzzles are shown to improve cognitive function and help stroke and dementia patients to have an overall improvement. Once you start cryptograms its highly entertaining and can become a great source of fun. Each cryptoquote puzzle is based on a success quote. If you get stuck on any puzzle there is a hint section included in the book. All solutions are in the back. Large book size 8.5 x 11 inches and each puzzle is extra large print with lots of room to write while solving each puzzle. Makes a great gift or stocking stuffer.